Modeling of Mine Tailings Dam Failure with OpenFOAM - Tamboraque Site - Videos

Tailings dams are supposed to last forever but they fail regularly due to a series of factors related to the construction and maintenance of the mine site. Accoring the cronology of mayor tailings dam failures of WISE Uranium Proyect there has been one mayor failure in 2017, two on 2016 and the last one in South America was on 2015 in Minas Gerias - Brasil. 

This article show the numerical modeling of a tailings dam failure relate to the Tamboraque site in Peru andes. The model represents the dynamic transport of tailings material as a non-newtonian fluid. Model was developed using high-end open source software as OpenFOAM, Salome Platform and QGIS.

Read More

Evaporation and Homogeneous Redox Reactions Simulation with Phreeqc

Evaporation is accomplished by removing water from the chemical system. Water can be removed as an irreversible reactant with a negative reaction coefficient in the REACTION keyword input. This example uses this method; the REACTION data block is used to simulate concentration of rain water by approximately 20 fold by removing 95 percent of the water. The resulting solution contains only about 0.05 kg of water. In a subsequent simulation, the MIX keyword is used to generate a solution that has the same concentrations as the evaporated solution, but has a total of mass of water of approximately 1 kg.

Read More

Geochemical Simulation Tutorial of Water Mixing with Phreeqc

This example demonstrates the capabilities of PHREEQC to perform a series of geochemical simulations, with the final simulations relying on results from previous simulations within the same run. The example investigates diagenetic reactions that may occur in zones where seawater mixes with carbonate ground water. This example is take from the Phreeqc documentation that can be found here:

https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/html/final-72.html

Read More

Solubility and Thermodynamic Stability of Gypsum and Anhydrite with Water with Phreeqc

PHREEQC version 3 is a computer program written in the C and C++ programming languages that is designed to perform a wide variety of aqueous geochemical calculations. PHREEQC implements several types of aqueous models: two ion-association aqueous models (the Lawrence Livermore National Laboratory model and WATEQ4F), a Pitzer specific-ion-interaction aqueous model, and the SIT (Specific ion Interaction Theory) aqueous model. Using any of these aqueous models, PHREEQC has capabilities for (1) speciation and saturation-index calculations; (2) batch-reaction and one-dimensional (1D) transport calculations with reversible and irreversible reactions.

This tutorial shows how to calculate the solubility and relative thermodynamic stability of two minerals, gypsum and anhydrit as a function of temperature at 1 atm.

Read More

Aqueous species in water speciation calculation with Phreeqc tutorial

This example calculates the distribution of aqueous species in seawater and the saturation state of seawater relative to a set of minerals. To demonstrate how to expand the model to new elements, uranium is added to the aqueous model defined by phreeqc.dat.

Read More

Geostatistics on water resources investigation

Before talking about the different researches that have had as main focus water resources, I think it is necessary to explain first what geostatistics is.

Geostatistics is a type of statistics that is used to analyze and interpret geographically referenced data. It is not restricted to work only with point data, it also works with GIS layers to explore spatial variation, improve generation of digital elevation models (DEM) and their respective simulations, optimize spatial sampling, etc. [1]

Read More

What about landsat LDCM for water resources?

A Landsat satellite was launched one Monday (Feb. 11, 2013) from the Vanderberg Air Force Base in California. The LDCM or Landsat Data Continuity Mission joined the 15-year-old Landsat 7 and the 30-year-old Landsat 5. Since satellites are attracted by earth’s gravity, the launch of new satellites is important to preserve the continuity of the image registration.

Read More